Sep 20 – 24, 2021
America/Vancouver timezone

Effects of Magnetic Filter SMF on the Reduction in Co-Extracted Electrons for Cs-free Negative Ion Source Using TPDsheet-U

Not scheduled
20m
Poster Negative ion sources Poster Session 2

Speaker

Mr Hiroki Kaminaga (Tokai university)

Description

TPDsheet-U[1] has been designed to research behaviors of the negative hydrogen ions (H${^−}$) in the high-density sheet-plasma, which is optimized for volume production. Also, H${^−}$ is produced by volume production at periphery of sheet plasma.[2] The reduction of the electron co-extraction is an essential issue for all negative-ion sources. We are currently researching the extraction system for reduction of the co-extracted electrons.[3,4] In this contribution, we represent the improved extraction system on TPDsheet-U by attaching the soft magnetic material plate for magnetic filter (SMF) on plasma grid for reduction of co-extraction electrons. The minimum current ratio I${_e}$/I${_H}$- and H${^−}$ current density J${_H}$- was ~0.2 and 2.2mA/cm${^2}$ at discharge current of 50A.
[1]K.Hanai, et al., Plasma Fusion Res. (2020).
[2]K.Hanai, et al., Fusion Eng. Des. (2019).
[3]H. Kaminaga, et al., Rev. Sci. Instrum. (2020).
[4]H. Kaminaga, et al., Fusion Eng. Des. (2021).

E-mail for contact person 6bsp1114@hope.tokai-u.jp
Funding Information National institute for fusion science, Japan Society for the Promotion of Science

Primary author

Mr Hiroki Kaminaga (Tokai university)

Co-authors

Mr Ryuichi Onuma (Tokai university) Mr Taiga Goka (Tokai university) Dr Toshikio Takimoto (Tokai university) Prof. Akira Tonegawa (Tokai university) Prof. Kohnosuke Sato (Tokyo University of Science)

Presentation materials